[ONOS-2359]Implementation of PCEP LabelReserve message

Change-Id: Ie74340f5fe5e93d9bb277dd3551ba175ac74494c

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.pcepio.protocol.ver1;
+
+import java.util.LinkedList;
+import java.util.ListIterator;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.exceptions.PcepParseException;
+import org.onosproject.pcepio.protocol.PcepLabelRangeObject;
+import org.onosproject.pcepio.types.PathSetupTypeTlv;
+import org.onosproject.pcepio.types.PcepObjectHeader;
+import org.onosproject.pcepio.types.PcepValueType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+public class PcepLabelRangeObjectVer1 implements PcepLabelRangeObject {
+
+    /*
+     * ref : draft-zhao-pce-pcep-extension-for-pce-controller-01, section : 7.2
+            0                   1                   2                     3
+            0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+           | label type    | range size                                    |
+           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+           |                        label base                             |
+           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+           |                                                               |
+           //                      Optional TLVs                           //
+           |                                                               |
+           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                               LABEL-RANGE Object
+     */
+    protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeObjectVer1.class);
+
+    public static final byte LABEL_RANGE_OBJ_TYPE = 1;
+    public static final byte LABEL_RANGE_OBJ_CLASS = 60; //to be defined
+    public static final byte LABEL_RANGE_OBJECT_VERSION = 1;
+    public static final short LABEL_RANGE_OBJ_MINIMUM_LENGTH = 12;
+    public static final int MINIMUM_COMMON_HEADER_LENGTH = 4;
+    //P flag and I flag must be set to 0
+    static final PcepObjectHeader DEFAULT_LABELRANGE_OBJECT_HEADER = new PcepObjectHeader(LABEL_RANGE_OBJ_CLASS,
+            LABEL_RANGE_OBJ_TYPE, PcepObjectHeader.REQ_OBJ_OPTIONAL_PROCESS, PcepObjectHeader.RSP_OBJ_PROCESSED,
+            LABEL_RANGE_OBJ_MINIMUM_LENGTH);
+
+    private PcepObjectHeader labelRangeObjHeader;
+    private byte labelType;
+    private int rangeSize;
+    private int labelBase;
+    //Optional TLV
+    private LinkedList<PcepValueType> llOptionalTlv;
+
+    /**
+     * Constructor to initialize parameters for PCEP label range object.
+     *
+     * @param labelRangeObjHeader label range object header
+     * @param labelType label type
+     * @param rangeSize range size
+     * @param labelBase label base
+     * @param llOptionalTlv list of optional tlvs
+     */
+    public PcepLabelRangeObjectVer1(PcepObjectHeader labelRangeObjHeader, byte labelType, int rangeSize, int labelBase,
+            LinkedList<PcepValueType> llOptionalTlv) {
+        this.labelRangeObjHeader = labelRangeObjHeader;
+        this.labelType = labelType;
+        this.rangeSize = rangeSize;
+        this.llOptionalTlv = llOptionalTlv;
+        this.labelBase = labelBase;
+    }
+
+    @Override
+    public void setLabelRangeObjHeader(PcepObjectHeader obj) {
+        this.labelRangeObjHeader = obj;
+    }
+
+    @Override
+    public void setLabelType(byte labelType) {
+        this.labelType = labelType;
+    }
+
+    @Override
+    public void setRangeSize(int rangeSize) {
+        this.rangeSize = rangeSize;
+    }
+
+    @Override
+    public void setLabelBase(int labelBase) {
+        this.labelBase = labelBase;
+    }
+
+    @Override
+    public PcepObjectHeader getLabelRangeObjHeader() {
+        return this.labelRangeObjHeader;
+    }
+
+    @Override
+    public byte getLabelType() {
+        return this.labelType;
+    }
+
+    @Override
+    public int getRangeSize() {
+        return this.rangeSize;
+    }
+
+    @Override
+    public int getLabelBase() {
+        return this.labelBase;
+    }
+
+    /**
+     * Reads from the channel buffer and returns object of  PcepLabelRangeObject.
+     *
+     * @param cb of type channel buffer
+     * @return object of  PcepLabelRangeObject
+     * @throws PcepParseException when fails to read from channel buffer
+     */
+    public static PcepLabelRangeObject read(ChannelBuffer cb) throws PcepParseException {
+
+        PcepObjectHeader labelRangeObjHeader;
+        byte labelType;
+        int rangeSize;
+        int labelBase;
+
+        LinkedList<PcepValueType> llOptionalTlv = new LinkedList<PcepValueType>();
+
+        labelRangeObjHeader = PcepObjectHeader.read(cb);
+
+        //take only LabelRangeObject buffer.
+        ChannelBuffer tempCb = cb.readBytes(labelRangeObjHeader.getObjLen() - MINIMUM_COMMON_HEADER_LENGTH);
+        int temp = 0;
+        temp = tempCb.readInt();
+        rangeSize = temp & 0x00FFFFFF;
+        labelType = (byte) (temp >> 24);
+        labelBase = tempCb.readInt();
+        llOptionalTlv = parseOptionalTlv(tempCb);
+        return new PcepLabelRangeObjectVer1(labelRangeObjHeader, labelType, rangeSize, labelBase, llOptionalTlv);
+    }
+
+    @Override
+    public int write(ChannelBuffer cb) throws PcepParseException {
+
+        int objStartIndex = cb.writerIndex();
+
+        //write common header
+        int objLenIndex = labelRangeObjHeader.write(cb);
+        int temp = 0;
+        temp = labelType;
+        temp = temp << 24;
+        temp = temp | rangeSize;
+        cb.writeInt(temp);
+
+        // Add optional TLV
+        if (!packOptionalTlv(cb)) {
+            throw new PcepParseException("Error while writing Optional tlv.");
+        }
+
+        //now write LabelRange Object Length
+        cb.setShort(objLenIndex, (short) (cb.writerIndex() - objStartIndex));
+        return cb.writerIndex() - objStartIndex;
+    }
+
+    /**
+     * Returns list of optional tlvs.
+     *
+     * @param cb of type channle buffer
+     * @return list of optional tlvs
+     * @throws PcepParseException whne fails to parse list of optional tlvs
+     */
+    public static LinkedList<PcepValueType> parseOptionalTlv(ChannelBuffer cb) throws PcepParseException {
+
+        LinkedList<PcepValueType> llOutOptionalTlv = new LinkedList<PcepValueType>();
+
+        while (MINIMUM_COMMON_HEADER_LENGTH <= cb.readableBytes()) {
+
+            PcepValueType tlv;
+            int iValue;
+            short hType = cb.readShort();
+            short hLength = cb.readShort();
+
+            switch (hType) {
+
+            case PathSetupTypeTlv.TYPE:
+                iValue = cb.readInt();
+                tlv = new PathSetupTypeTlv(iValue);
+                break;
+
+            default:
+                throw new PcepParseException("Unsupported TLV in LabelRange Object.");
+            }
+
+            // Check for the padding
+            int pad = hLength % 4;
+            if (0 < pad) {
+                pad = 4 - pad;
+                if (pad <= cb.readableBytes()) {
+                    cb.skipBytes(pad);
+                }
+            }
+            llOutOptionalTlv.add(tlv);
+        }
+        return llOutOptionalTlv;
+    }
+
+    /**
+     * Pack optional tlvs.
+     *
+     * @param cb of channel buffer
+     * @return true
+     */
+    protected boolean packOptionalTlv(ChannelBuffer cb) {
+
+        ListIterator<PcepValueType> listIterator = llOptionalTlv.listIterator();
+
+        while (listIterator.hasNext()) {
+            PcepValueType tlv = listIterator.next();
+
+            if (null == tlv) {
+                log.debug("tlv is null from OptionalTlv list");
+                continue;
+            }
+            tlv.write(cb);
+
+            // need to take care of padding
+            int pad = tlv.getLength() % 4;
+            if (0 != pad) {
+                pad = 4 - pad;
+                for (int i = 0; i < pad; ++i) {
+                    cb.writeByte((byte) 0);
+                }
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Builder class for PCEP label range object.
+     */
+    public static class Builder implements PcepLabelRangeObject.Builder {
+        private boolean bIsHeaderSet = false;
+        private boolean bIsLabelType = false;
+        private boolean bIsRangeSize = false;
+        private boolean bIsLabelBase = false;
+
+        byte labelType;
+        int rangeSize;
+        int labelBase;
+        private boolean bIsPFlagSet = false;
+        private boolean bPFlag;
+
+        private boolean bIsIFlagSet = false;
+        private boolean bIFlag;
+        private PcepObjectHeader labelRangeObjHeader;
+
+        LinkedList<PcepValueType> llOptionalTlv = new LinkedList<PcepValueType>();
+
+        @Override
+        public PcepLabelRangeObject build() throws PcepParseException {
+            PcepObjectHeader labelRangeObjHeader = this.bIsHeaderSet ? this.labelRangeObjHeader
+                    : DEFAULT_LABELRANGE_OBJECT_HEADER;
+
+            if (!this.bIsLabelType) {
+                throw new PcepParseException("LabelType NOT Set while building label range object.");
+            }
+
+            if (!this.bIsRangeSize) {
+                throw new PcepParseException("RangeSize NOT Set while building label range object.");
+            }
+
+            if (!this.bIsLabelBase) {
+                throw new PcepParseException("LabelBase NOT Set while building label range object.");
+            }
+
+            if (bIsPFlagSet) {
+                labelRangeObjHeader.setPFlag(bPFlag);
+            }
+
+            if (bIsIFlagSet) {
+                labelRangeObjHeader.setIFlag(bIFlag);
+            }
+            return new PcepLabelRangeObjectVer1(labelRangeObjHeader, this.labelType, this.rangeSize, this.labelBase,
+                    this.llOptionalTlv);
+        }
+
+        @Override
+        public PcepObjectHeader getLabelRangeObjHeader() {
+            return this.labelRangeObjHeader;
+        }
+
+        @Override
+        public Builder setLabelRangeObjHeader(PcepObjectHeader obj) {
+            this.labelRangeObjHeader = obj;
+            this.bIsHeaderSet = true;
+            return this;
+        }
+
+        @Override
+        public byte getLabelType() {
+            return this.labelType;
+        }
+
+        @Override
+        public Builder setLabelType(byte labelType) {
+            this.labelType = labelType;
+            this.bIsLabelType = true;
+            return this;
+        }
+
+        @Override
+        public int getRangeSize() {
+            return this.rangeSize;
+        }
+
+        @Override
+        public Builder setRangeSize(int rangeSize) {
+            this.rangeSize = rangeSize;
+            this.bIsRangeSize = true;
+            return this;
+        }
+
+        @Override
+        public int getLabelBase() {
+            return this.labelBase;
+        }
+
+        @Override
+        public Builder setLabelBase(int labelBase) {
+            this.labelBase = labelBase;
+            this.bIsLabelBase = true;
+            return this;
+        }
+
+        @Override
+        public Builder setPFlag(boolean value) {
+            this.bPFlag = value;
+            this.bIsPFlagSet = true;
+            return this;
+        }
+
+        @Override
+        public Builder setIFlag(boolean value) {
+            this.bIFlag = value;
+            this.bIsIFlagSet = true;
+            return this;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass()).add("LabelType", labelType).add("rangeSize", rangeSize)
+                .add("labelBase", labelBase).add("optionalTlvList", llOptionalTlv).toString();
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.pcepio.protocol.ver1;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.exceptions.PcepParseException;
+import org.onosproject.pcepio.protocol.PcepLabelRange;
+import org.onosproject.pcepio.protocol.PcepLabelRangeResvMsg;
+import org.onosproject.pcepio.protocol.PcepMessageReader;
+import org.onosproject.pcepio.protocol.PcepMessageWriter;
+import org.onosproject.pcepio.protocol.PcepType;
+import org.onosproject.pcepio.protocol.PcepVersion;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+class PcepLabelRangeResvMsgVer1 implements PcepLabelRangeResvMsg {
+
+    // Pcep version: 1
+
+    /*
+       The format of a PCLRResv message is as follows:
+
+               PCLRResv Message>::= <Common Header>
+                                    <label-range>
+          Where:
+
+               <label-range> ::= <SRP>
+                                 <labelrange-list>
+
+          Where
+               <labelrange-list>::=<LABEL-RANGE>[<labelrange-list>]
+     */
+    protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeResvMsgVer1.class);
+
+    public static final byte PACKET_VERSION = 1;
+    // LabelRangeResvMsgMinLength = COMMON-HEADER(4)+SrpObjMinLentgh(12)+LABEL-RANGE-MIN-LENGTH(12)
+    public static final int PACKET_MINIMUM_LENGTH = 28;
+    public static final PcepType MSG_TYPE = PcepType.LABEL_RANGE_RESERV;
+    //<label-range>
+    PcepLabelRange labelRange;
+
+    public static final PcepLabelRangeResvMsgVer1.Reader READER = new Reader();
+
+    //Reader reads LabelRangeResv Message from the channel.
+    static class Reader implements PcepMessageReader<PcepLabelRangeResvMsg> {
+
+        @Override
+        public PcepLabelRangeResvMsg readFrom(ChannelBuffer cb) throws PcepParseException {
+
+            if (cb.readableBytes() < PACKET_MINIMUM_LENGTH) {
+                throw new PcepParseException("Channel buffer has less readable bytes than Packet minimum length.");
+            }
+            // fixed value property version == 1
+            byte version = cb.readByte();
+            version = (byte) (version >> PcepMessageVer1.SHIFT_FLAG);
+            if (version != PACKET_VERSION) {
+                throw new PcepParseException("Wrong version. Expected=PcepVersion.PCEP_1(1), got=" + version);
+            }
+            // fixed value property type == 15
+            byte type = cb.readByte();
+            if (type != MSG_TYPE.getType()) {
+                throw new PcepParseException("Wrong type. Expected=PcepType.LABEL_RANGE_RESERV(15), got=" + type);
+            }
+            short length = cb.readShort();
+            if (length < PACKET_MINIMUM_LENGTH) {
+                throw new PcepParseException("Wrong length.Expected to be >= " + PACKET_MINIMUM_LENGTH + ", is: "
+                        + length);
+            }
+            // parse <label-range>
+            PcepLabelRange labelRange = PcepLabelRangeVer1.read(cb);
+            return new PcepLabelRangeResvMsgVer1(labelRange);
+        }
+    }
+
+    /**
+     * Constructor to initialize PCEP label range.
+     *
+     * @param labelRange PCEP label range
+     */
+    PcepLabelRangeResvMsgVer1(PcepLabelRange labelRange) {
+        this.labelRange = labelRange;
+    }
+
+    /**
+     * Builder class for PCEP label range reserve message.
+     */
+    static class Builder implements PcepLabelRangeResvMsg.Builder {
+
+        PcepLabelRange labelRange = new PcepLabelRangeVer1();
+
+        @Override
+        public PcepVersion getVersion() {
+            return PcepVersion.PCEP_1;
+        }
+
+        @Override
+        public PcepType getType() {
+            return PcepType.LABEL_RANGE_RESERV;
+        }
+
+        @Override
+        public PcepLabelRangeResvMsg build() {
+            return new PcepLabelRangeResvMsgVer1(this.labelRange);
+        }
+
+        @Override
+        public PcepLabelRange getLabelRange() {
+            return this.labelRange;
+        }
+
+        @Override
+        public Builder setLabelRange(PcepLabelRange labelRange) {
+            this.labelRange = labelRange;
+            return this;
+        }
+    }
+
+    @Override
+    public void writeTo(ChannelBuffer cb) throws PcepParseException {
+        WRITER.write(cb, this);
+    }
+
+    static final Writer WRITER = new Writer();
+
+    //Writer writes LabelRangeResv Message to the channel.
+    static class Writer implements PcepMessageWriter<PcepLabelRangeResvMsgVer1> {
+
+        @Override
+        public void write(ChannelBuffer cb, PcepLabelRangeResvMsgVer1 message) throws PcepParseException {
+
+            int startIndex = cb.writerIndex();
+            // first 3 bits set to version
+            cb.writeByte((byte) (PACKET_VERSION << PcepMessageVer1.SHIFT_FLAG));
+            // message type
+            cb.writeByte(MSG_TYPE.getType());
+            // Length will be set after calculating length, but currently set it as 0.
+            int msgLenIndex = cb.writerIndex();
+
+            cb.writeShort((short) 0);
+            //write Label Range
+            message.labelRange.write(cb);
+
+            // update message length field
+            int length = cb.writerIndex() - startIndex;
+            cb.setShort(msgLenIndex, (short) length);
+        }
+    }
+
+    @Override
+    public PcepVersion getVersion() {
+        return PcepVersion.PCEP_1;
+    }
+
+    @Override
+    public PcepType getType() {
+        return MSG_TYPE;
+    }
+
+    @Override
+    public PcepLabelRange getLabelRange() {
+        return this.labelRange;
+    }
+
+    @Override
+    public void setLabelRange(PcepLabelRange lr) {
+        this.labelRange = lr;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass()).add("labelRange", labelRange).toString();
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.pcepio.protocol.ver1;
+
+import java.util.LinkedList;
+import java.util.ListIterator;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.exceptions.PcepParseException;
+import org.onosproject.pcepio.protocol.PcepLabelRange;
+import org.onosproject.pcepio.protocol.PcepLabelRangeObject;
+import org.onosproject.pcepio.protocol.PcepSrpObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Provides PCEP Label Range.
+ */
+public class PcepLabelRangeVer1 implements PcepLabelRange {
+
+    protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeVer1.class);
+
+    /*
+        <label-range> ::= <SRP>
+                          <labelrange-list>
+        Where
+                <labelrange-list>::=<LABEL-RANGE>[<labelrange-list>]
+     */
+
+    // PCEP SRP Object
+    private PcepSrpObject srpObject;
+    //<labelrange-list> of type PcepLabelRangeObject.
+    private LinkedList<PcepLabelRangeObject> llLabelRangeList;
+
+    /**
+     * Default Constructor.
+     */
+    public PcepLabelRangeVer1() {
+        srpObject = null;
+        llLabelRangeList = null;
+    }
+
+    /**
+     * Constructor to initialize objects.
+     *
+     * @param srpObj PCEP Srp object.
+     * @param llLabelRangeList list of PcepLabelRangeObject.
+     */
+    PcepLabelRangeVer1(PcepSrpObject srpObj, LinkedList<PcepLabelRangeObject> llLabelRangeList) {
+        this.srpObject = srpObj;
+        this.llLabelRangeList = llLabelRangeList;
+    }
+
+    @Override
+    public PcepSrpObject getSrpObject() {
+        return srpObject;
+    }
+
+    @Override
+    public void setSrpObject(PcepSrpObject srpObject) {
+        this.srpObject = srpObject;
+
+    }
+
+    @Override
+    public LinkedList<PcepLabelRangeObject> getLabelRangeList() {
+        return llLabelRangeList;
+    }
+
+    @Override
+    public void setLabelRangeList(LinkedList<PcepLabelRangeObject> ll) {
+        this.llLabelRangeList = ll;
+    }
+
+    /**
+     * Reads channel buffer and returns object of PcepLabelRange.
+     *
+     * @param cb of type channel buffer.
+     * @return object of PcepLabelRange
+     * @throws PcepParseException when fails to read from channel buffer
+     */
+    public static PcepLabelRange read(ChannelBuffer cb) throws PcepParseException {
+
+        //parse and store SRP mandatory object
+        PcepSrpObject srpObj = null;
+        srpObj = PcepSrpObjectVer1.read(cb);
+        if (srpObj == null) {
+            throw new PcepParseException("Exception while parsing srp object");
+        }
+
+        LinkedList<PcepLabelRangeObject> llLabelRangeList = new LinkedList<PcepLabelRangeObject>();
+        boolean bFoundLabelRangeObj = false;
+        while (0 < cb.readableBytes()) {
+            //parse and store <labelrange-list>
+            PcepLabelRangeObject lrObj;
+            lrObj = PcepLabelRangeObjectVer1.read(cb);
+            if (lrObj == null) {
+                throw new PcepParseException("Exception while parsing label range object");
+            } else {
+                llLabelRangeList.add(lrObj);
+                bFoundLabelRangeObj = true;
+            }
+        }
+
+        if (!bFoundLabelRangeObj) {
+            throw new PcepParseException("At least one LABEL-RANGE MUST be present.");
+        }
+        return new PcepLabelRangeVer1(srpObj, llLabelRangeList);
+    }
+
+    @Override
+    public int write(ChannelBuffer cb) throws PcepParseException {
+        //write Object header
+        int objStartIndex = cb.writerIndex();
+
+        //write <SRP>
+        int objLenIndex = srpObject.write(cb);
+
+        if (objLenIndex <= 0) {
+            throw new PcepParseException("bjectLength is " + objLenIndex);
+        }
+
+        //write <labelrange-list>
+        ListIterator<PcepLabelRangeObject> listIterator = llLabelRangeList.listIterator();
+        while (listIterator.hasNext()) {
+            listIterator.next().write(cb);
+        }
+
+        //Update object length now
+        int length = cb.writerIndex() - objStartIndex;
+        // As per RFC the length of object should be
+        // multiples of 4
+        int pad = length % 4;
+        if (pad != 0) {
+            pad = 4 - pad;
+            for (int i = 0; i < pad; i++) {
+                cb.writeByte((byte) 0);
+            }
+            length = length + pad;
+        }
+        cb.setShort(objLenIndex, (short) length);
+        return length;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass()).add("srpObject", srpObject)
+                .add("LabelRangeList", llLabelRangeList).toString();
+    }
+}

+package org.onosproject.pcepio.types;
+
+import java.util.Objects;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.onosproject.pcepio.protocol.PcepVersion;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Provides PcepSetup type tlv.
+ */
+public class PathSetupTypeTlv implements PcepValueType {
+
+    /*
+       Reference : draft-sivabalan-pce-lsp-setup-type-02.
+
+         0                   1                   2                     3
+          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+         | Type                          | Length                        |
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+         | Reserved                                      | PST           |
+         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+                     Figure 1: PATH-SETUP-TYPE TLV
+
+     */
+    protected static final Logger log = LoggerFactory.getLogger(PathSetupTypeTlv.class);
+
+    public static final short TYPE = 0; //TODO : need to reassign the value as per RFC
+    public static final short LENGTH = 4;
+
+    private final byte pst;
+    private final int rawValue;
+    private final boolean isRawValueSet;
+
+    /**
+     * Constructor to initialize parameters for path setup type tlv.
+     *
+     * @param rawValue parameter for path setup type tlv
+     */
+    public PathSetupTypeTlv(final int rawValue) {
+        this.rawValue = rawValue;
+        this.isRawValueSet = true;
+        this.pst = (byte) rawValue;
+    }
+
+    /**
+     * Constructor to initialize pst.
+     *
+     * @param pst PST
+     */
+    public PathSetupTypeTlv(byte pst) {
+        this.pst = pst;
+        this.rawValue = 0;
+        this.isRawValueSet = false;
+    }
+
+    /**
+     * Returns Object of path setup type tlv.
+     *
+     * @param raw parameter for path setup type tlv
+     * @return object of PathSetupTypeTlv
+     */
+    public static PathSetupTypeTlv of(final int raw) {
+        return new PathSetupTypeTlv(raw);
+    }
+
+    @Override
+    public PcepVersion getVersion() {
+        return PcepVersion.PCEP_1;
+    }
+
+    /**
+     * Returns parameters for path setup type tlv.
+     *
+     * @return parameters for path setup type tlv
+     */
+    public int getInt() {
+        return rawValue;
+    }
+
+    /**
+     * Returns the pst value.
+     *
+     * @return pst value
+     */
+    public byte getPst() {
+        return pst;
+    }
+
+    @Override
+    public short getType() {
+        return TYPE;
+    }
+
+    @Override
+    public short getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(pst);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof PathSetupTypeTlv) {
+            PathSetupTypeTlv other = (PathSetupTypeTlv) obj;
+            return Objects.equals(this.pst, other.pst);
+        }
+        return false;
+    }
+
+    @Override
+    public int write(ChannelBuffer c) {
+        int iLenStartIndex = c.writerIndex();
+        c.writeShort(TYPE);
+        c.writeShort(LENGTH);
+        c.writeInt(pst);
+        return c.writerIndex() - iLenStartIndex;
+    }
+
+    /**
+     * Returns the object of type PathSetupTypeTlv.
+     *
+     * @param c is type Channel buffer
+     * @return object of PathSetupTypeTlv
+     */
+    public static PathSetupTypeTlv read(ChannelBuffer c) {
+        return PathSetupTypeTlv.of(c.readInt());
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass()).add("Type", TYPE).add("Length", LENGTH).add("PST", pst)
+                .toString();
+    }
+}